International Library of Technology · Scranton, International Textbook Co. · leaf 403
high voltage at the arc(from 70 to 80 volts).Open-arc lamps take onlyfrom 40 to 50 volts at thearc; hence, if these lampswere operated singly across100- to 120-volt circuits, there would have to be from 60 to80 volts taken up in the resistance. To avoid this, open-arc lamps were usually operated… … fig. 23. 3(5 ELECTRIC LIGHTING. § 18 way, but the arrangement never worked entirely satisfac-tory. If one lamp failed to work properly, it affected theother, and the service was not as good as it should havebeen. This method of operating lamps has therefore beenreplaced by the use of the single…
Electrical engineering
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